An is an that has been modified so that it is more useful.
a.
industry . . idea
b.
idea . . industry
c.
innovation . . invention
d.
invention . . innovation

The correct answer is C. An innovation is an invention that has been modified so that it is more useful.

Innovation is a change that introduces novelties, and that refers to modifying existing elements in order to improve or renew them; that is, it is the creation or modification of a product, and its introduction into a market.

Innovation is a key factor for business development and economic growth of countries, being those that invest the most in research and innovation the most wealthy.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

bloodiest single day of war   |   gettysburg

where the civil war ends for good   | appomattox court house

the first major land battle; south wins | bull run/manassas (va)

gives union control of the mississippi river |   vicksburg

lee’s first tactical defeat; big win for union |   fort sumter1

with lincoln's re-election |   atlanta

south wins

splits confederacy in two for the duration of the war,

antietam